Use of optically stimulated luminescence dosimeter and radiophotoliminescent glass dosimeter for dose measurement in dual-source dual-energy computed tomography
Use of optically stimulated luminescence dosimeter and radiophotoliminescent glass dosimeter for dose measurement in dual-source dual-energy computed tomography
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DOI：
10.1007/s13246-021-01063-6
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发表时间：
2021-10-19
影响因子：
4.4
通讯作者：
Takemura，Akihiro
中科院分区：
文献类型：
--
作者：
Hirosawa，Ayaka;Matsubara，Kosuke;Takemura，Akihiro
我们旨在评估用于双源双能(DE)计算机断层扫描(DECT)剂量测量的光激发发光剂量计(OSLD)和放射光致发光玻璃剂量计(RPLD)的性能。在单能量(SE)和DE模式下进行了能量依赖性评估，在等效能量下，OSLD和RPLD的相对剂量响应分别相差3.8%和6.6%。剂量变异系数为10个剂量计的剂量变异系数，SE模式下OSLD和RPLD的剂量变异分别为2.1~3.0%和2.1~2.8%，DE模式下的剂量变异分别为1.8%和2.6%。剂量线性范围为1~150mGy.剂量计与电离室之间呈线性关系(相关系数≥为0.9991)。在−90~+90范围内评估角度依赖性，且DE模式下的角度依赖性小于SE模式下的。在SE和DE模式下，ą30和ą60的标准化反应较高，−90的标准化反应较低。这项研究表明，OSLD和RPLD都可以在双源DECT中进行剂量测量，与SECT相比，剂量计性能的影响很小。
We aimed to evaluate properties of optically stimulated luminescence dosimeters (OSLDs) and radiophotoluminescent glass dosimeters (RPLDs) used in dual-source dual-energy (DE) computed tomography (DECT) dosimetry. Energy dependence was evaluated in single-energy (SE) and DE modes, and their relative dose responses differed by 3.8% and 6.6% under equivalent effective energy with OSLD and RPLD, respectively. Dose variation was evaluated using coefficients of variation of dose values from 10 dosimeters, and dose variation of OSLD and RPLD in SE mode ranged from 2.1 to 3.0% and from 2.1 to 2.8%, and those in the DE mode were 1.8 and 2.6%, respectively. Dose linearity was evaluated from 1 to 150 mGy, and linear relationships of dose response were observed between the dosimeters and the ionization chamber (correlation coefficients≥ 0.9991). Angular dependence was evaluated from− 90 to+ 90, and it was smaller in DE mode than in SE mode for OSLD. The normalized response of RPLD was higher at ą 30 and ą 60 and lower at− 90 in SE and DE modes. This study demonstrated both OSLD and RPLD can perform dosimetry in dual-source DECT with small influence of the properties of the dosimeters compared with that in SECT.